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(11) | EP 2 204 835 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Switching mechanism capable of indicating contacts status and mold cased circuit breaker having the same mechanism |
| (57) Disclosed is a switching mechanism for a mold cased circuit breaker, capable of indicating
a contacts status by a position of a handle. The switching mechanism comprises a handle
4; a lever 5 providing a rotation supporting point of the handle; a shaft 3 configured
to rotatably support a movable contactor; a trip spring 6 having an upper end supported
by the handle, and configured to indicate a melt-adhered state of contacts by manipulating
the handle to a TRIP position from an OFF position since a horizontal position of
a lower end supporting point thereof in the TRIP position is discordant with a horizontal
position of a rotation supporting point of the lever; a latch 8 configured to restrict
the trip spring; an upper link and a lower link; a toggle pin configured to support
a lower end of the trip spring so as to provide the lower end supporting point; a
latch holder 9; a nail 10 rotatable to a position to restrict or release the latch
holder; and an isolation lever 11 having one end connected to the shaft and another
end contactable to the nail, pressed by the lever by being upwardly moved so as to
contact the lever, and configured to push the nail to a position to release the latch
holder when manipulating the handle to an OFF position in a state that the contact
of the movable contactor and the contact of the fixed contactor are melt-adhered to
each other.
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